There are no free meals anywhere. A faucet usually changes your time and effort for a minimal amount of crypto in return. They made sense in the past when the price was very low and made sense to accumulate this way, but nowadays that is gone really - it does not matter if it is a casino or anything else - your time is more valuable that a few sats.
A few satoshis one would not even be able to withdraw anyways, because of the high minim withdrawals set up by the casino staff themselves, it is about increasing profitability and minimizing the chances for people to actually get money off the casino, as usual.
By the way, you would be amazed on how much people with much spare time are willing to sacrifice hours of their life to get some free satoshis they can later gamble away in some spins of rolling dices. If they thought a bit, they would realize they could monetize their time in a more effective way by applying to an actual job, instead trying to get a few satoshis to gamble in less than an hour. I talk from personal experience, by the way, because when I had much spare time when I was younger I used to spend a whole afternoon accumulating satoshis from a casino faucet and then, when I got a fairly amount (not enough to withdraw) I decided to gambled it all. Never had good luck with those satoshis, obviously.
